> There's something deeply wrong with the culture
Another possibility: Women in poorer countries enrol in CS out of necessity. In wealthy countries, they have more economic freedom and there are more jobs available higher up on Maslow's Hierarchy, so they enrol in what they actually want (which is not CS).
On average.
Entirely accurate, in ex-communist eastern europe some sort of math/engineering job was about the only way to live somewhat decent, so anyone remotely ambitious would go into that.